Donald was not very good at math．
He could not understand the teacher's explanations．
Even when the teacher explained something a second time， Donald still could not understand it．
“Never mind，”Donald told himself．“I'm quite good at other subjects．I'll cheat in the math exam ，then I won't be in trouble．”
“I'll sit next to the boy who's best at math，”he thought，“And copy down his answers．”
The day of the exam came，and Donald sat next to Brian Smith，who was always at the top of the class in math．
Donald carefully copied Brian's answers on to his own exam paper．
At the end of the exam ，the teacher collected the papers and graded them ．
Then she said，“Well，boys and girls，I've decided to give a prize to the student who got the highest grade．It's difficult for me to decide whom to give the prize to，however， because two students，Donald and Brian，got the same grade．”
“Let them share it，”one of the other students said．
“I've thought about that，”the teacher said，“But I've decided to give the prize to Brian．”
Donald was angry when he heard this．
He stood up and said，“That's not fair．I got the same grade as Brian．”
“That's true，”the teacher said．“However，Brian's answer to Question 18 was‘I don't know’．Yours was‘Neither do I’．”
1．Donald decided to cheat in the math exam because ____ ．
A．he was always at the top of the class in math
B．he understood the questions
C．he was not very good at math
D．the math teacher did not explain the questions carefully
2．Donald got a high grade in math because ____ ．
A．math was his best subject
B．the questions were easy
C．he copied from another boy
D．the teacher explained the questions carefully
3．Donald got the same grade as Brian because ____ ．
A．both boys were good at math
B．Donald cheated
C．Brian copied Donald's answers
D．the questions were very easy
4．The teacher knew it was Donald who cheated because ____ ．
A．his answers were the same as Brian
B．he wrote“I don't know”as an answer
C．he got the same wrong answers as Brian
D．he wrote the words“Neither do I”
5．In the end，we can learn that ____ ．
A．both Brian and Donald won the prize
B．neither of Brian and Donald won the prize
C．Brian won the prize
D．Donald won the prize
Key: 1—5CCBDC
